SDQ responses from teachers

In the 11-year follow-up mothers were asked to give the DNBC permission to contact her child's teacher and ask him/her to fill in the "Strengths-and-Difficulties-Questionniare" (SDQ) regarding the child. 

A total of 19,118 teachers filled in the Strengths and Difficulties questionnaire for DNBC children, e.g. 65% of all the teachers asked.